Catalase is a tetramer of four polypeptide chains, each over 500 amino acids long.It contains four porphyrin heme (iron) groups that allow the enzyme to react with the hydrogen peroxide.The optimum pH for human catalase is approximately 7, and has a fairly broad maximum (the rate of reaction does not change appreciably at pHs between 6.8 and 7.5).atalase is a tetramer of four polypeptide chains, each over 500 amino acids long.
Josh Duhamel. Joshua David Josh Duhamel (/dÉËmÉl/ dÉ-MEL; born November 14, 1972) is an American actor and former fashion model. After various modeling work, he made his acting debut as Leo du Pres on the ABC daytime soap opera All My Children and later starred as Danny McCoy on NBC's Las Vegas.
Fergie (singer) Fergie Duhamel (/ËfÉËrÉ¡i dÉËmÉl/) (born Stacy Ann Ferguson; March 27, 1975) is an American singer, songwriter and actress. She is the female vocalist for the hip hop group The Black Eyed Peas, with whom she has achieved chart success worldwide.